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<p>Strengthening the study of modern sporopollen, vegetation, and climatic factors will improve the accuracy of palaeoclimate reconstruction using fossil sporopollen spectra. In this study, 188 surface-soil sporopollen samples were collected around the Tarim Basin in Xinjiang, China, located near the southern region of the Tianshan Mountains, eastern Pamir Plateau, and northern region of the Kunlun Mountains, with altitudes ranging from 888 to 4,530&#xa0;m (34°00’N-43°00’N, 74°00’E-94°00’E). Redundancy analysis was used to explore the relationship between these sporopollen data and 13 environmental factors. The results showed that main environmental factors affecting the distribution of surface-soil sporopollen assemblages in southern Xinjiang were mean spring precipitation, mean annual precipitation, altitude, and mean summer temperature. Pollen of <i>Picea</i> and Cyperaceae were affected by precipitation, whereas the response of Poaceae pollen was closely related to temperature. The climate ranges of the sampling sites for most pollen taxa at a high percentage and concentration coincided with the distribution of their parent species, such as <i>Picea</i> pollen, &gt;10% and &gt;500 grains/g; <i>Ephedra</i> pollen, &gt;20% and &gt;4,000 grains/g; <i>Nitraria</i> pollen, &gt;12% and &gt;200 grains/g; <i>Artemisia</i> pollen, &gt;80% and 5,000 grains/g; Asteraceae pollen, &gt;10% and &gt;100 grains/g, thereby providing an accurate reference for quantitative palaeoclimate reconstruction. Therefore, by investigating the relationship between surface-soil sporopollen and environmental factors in southern Xinjiang, we can combine data on the characteristics of the distribution of surface-soil sporopollen and climate, apply them to large-scale palaeoenvironmental reconstructions, and provide reliable information to protect the ecology of western arid and semi-arid regions.</p>

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Surface-soil sporopollen and their relationship with climatic factors in southern Xinjiang, China: implications for palaeoclimate reconstruction

  • 期刊论文

  • 发表日期：

    2025年2月21日

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  • Yun Zhang,
  • Lixin Chen,
  • Zhaochen Kong

摘要

Strengthening the study of modern sporopollen, vegetation, and climatic factors will improve the accuracy of palaeoclimate reconstruction using fossil sporopollen spectra. In this study, 188 surface-soil sporopollen samples were collected around the Tarim Basin in Xinjiang, China, located near the southern region of the Tianshan Mountains, eastern Pamir Plateau, and northern region of the Kunlun Mountains, with altitudes ranging from 888 to 4,530 m (34°00’N-43°00’N, 74°00’E-94°00’E). Redundancy analysis was used to explore the relationship between these sporopollen data and 13 environmental factors. The results showed that main environmental factors affecting the distribution of surface-soil sporopollen assemblages in southern Xinjiang were mean spring precipitation, mean annual precipitation, altitude, and mean summer temperature. Pollen of Picea and Cyperaceae were affected by precipitation, whereas the response of Poaceae pollen was closely related to temperature. The climate ranges of the sampling sites for most pollen taxa at a high percentage and concentration coincided with the distribution of their parent species, such as Picea pollen, >10% and >500 grains/g; Ephedra pollen, >20% and >4,000 grains/g; Nitraria pollen, >12% and >200 grains/g; Artemisia pollen, >80% and 5,000 grains/g; Asteraceae pollen, >10% and >100 grains/g, thereby providing an accurate reference for quantitative palaeoclimate reconstruction. Therefore, by investigating the relationship between surface-soil sporopollen and environmental factors in southern Xinjiang, we can combine data on the characteristics of the distribution of surface-soil sporopollen and climate, apply them to large-scale palaeoenvironmental reconstructions, and provide reliable information to protect the ecology of western arid and semi-arid regions.